let width,height=10,name="sumer", marry=true,job=null;
let fn = function (){};
document.write('width'+ '的数据类型是'+ typeof width +'</br>')
document.write('height='+height+ '的数据类型是'+ typeof height +'</br>')
document.write('name='+name+ '的数据类型是'+ typeof name +'</br>')
document.write('marry='+marry+ '的数据类型是'+ typeof marry +'</br>')
document.write('job='+job+ '的数据类型是'+ typeof job +'</br>')
document.write('fn='+fn+ '的数据类型是'+ typeof fn +'</br>')
